Electric motor for talking machines



W. W. DEAN.

ELECTRIC MOTOR FOR TALKING MACHINES. APPLICATION FILED JULY 17.1918.

1,41 5 ,430, Patented May 9, 1922.

2 SHEETSSHEET lx N RE v i I Q\ N; I, grim Q I \Illlllllllillllllll I APPLICATION FILED JULY 17,19H3- W. W. DEAN. ELECTRIC MOTOR FOR TALKING MACHINES.

Patenfed May 9,1922.

2 SHEETS-SHEET 2- WWW amventoz 32 W m M 13 Motors for Talking driven by the motor shaft.

i and the U ITED STATES PATENT OFFICE- mm w. mam; or nnwsnx,

rnrcn. comm, or mtwsnx,

To all whomit may concern:

Be it known that 1, WILLIAM WARREN DEAN, a citizen of the United States, residing at Newark in the county of Essex and State of New Jersey, have invented certain new and useful Im rovements in Electric achines, of. which the followin isa specification, reference being had to t e accompanying drawing.

The invention relates to, new and useful improvements in electric motors for-talking machines and more particuarly to the arrangement of the motor, the means for supporting the same and the speed governing mechanism used in conjunction therewith. It is well known; that the end thrust on the motor 'shaftdue to variatons in the voltage of the current supplied'to the motor and disturbances in the load on the motor, cause the motor shaft to move endwise movement of the motor shaft very eatly interferes with the speed governing of the motor so that it is very diflicult in the present type of speed governors to obtain a VGI tab e of the talking machine operated by the motor. I

An object of the present invention is to provide an equalizing mechanism in the train of mechanism between the motor shaft table of the talking machine, which enables this end thrust due to the causes specified, to be taken up without in anyway disturbing the effective control of the s of the table through the;- speed governor A further object of. the invention is to provide a motor for operating the table of the talking machine with a. speed 'vernor which is connected to the shaft of t ie motor at oneend thereof, while the table is operated from a connection to the motor shaft at the op osite end; of the motor. I

still 'further object of the invention is to provide a construction wherein the governor is located very closeto an and thrust bearing for the motor shaft, together withmeans for holding 'thebearing on the motor in of the motor shaft and consists of electric contacts, one of which is carried by a-fiexiblc shaft continuously in contact with the end thrust bearing therefor.

Specification of Letters 2mm.

ment of my invention;

endwise and this close regulation bf the speed of the NEW JERSEY, ASSIGNOB TO ELEC- NEW JERSEY, L CORPORATION 01' NEW ELECTRIC 101308 FOR TALIDTG xacmums. I

Patented May a, 1922.

Application ma m 17, ms. Serial m intain.-

to provide a supporting base plate which carries the motor, the vernor, the end thrust equalizing mechanism and the vertical shaft for-operating the table of the talking machine I These and other objects will in part be obvious and will in partbe hereinafter more fully disclosed. I I v -In the. drawings which show'by way of illustration one-embodiment of "this Tin- -vention; a

. x'F-igure 1 'is a view partly 'in' side elevation andlpartly in section showing one embodi- Fig. 2 is 'a sectional view on theline 2-2 of Fig. 1;

Fig. 3 is asectional view on the line 3-3 of Fig. 1.

The invention is directed to an electric motor for operating a talking machine and more articularly to the governing mechanism t erefor, which includes an equalizing mechanism for absorbing any endwise movement of the motor shaft so that the motor shaft will be maintained in a fixed endwise position as it rotates, notwithstanding the variation in the voltage of the current operating the motor and the variation in the load upon the motor. The motor is mounted on a sup ortin metallic base plate and pro .iecting n rom t e motor frame are spaced ugs havin bearings for the vertical shaft which carries the table of the talking machine. Intermediate the motor and the vertical shaft is my improved equalizing mechanism which consists of a positive driving connection between the motor shaft and the ve ical shaft operating the table and devices which will absorb the endwise thrust which would otherwise be imparted to the motor shaft from the vertical shaftoperating the table. This driving connection between the motor and the vertical shaft is in the form of a worm gear, being mounted so as to be capable of a limited endwise yielding movement which absorbs the thrust imposed upon the operating train of mechanism., The speed governmechanism is located at the opposite end arm having a weighted member intermediate the worm on one of the parts It will readily the point of support for the arm and the contact carried thereby, which weighted member is operated upon by centrifugal force and serves under predetermined conditions to ONBII the contacts and permit the same to close under other predetermined conditions. The motor shaft is moved endwise by a spring member which is preferably a part of the electric connections with the motor and the governor is disposed close to the end thrust bearing of the motor, so that temporary changes in the motor shaft will-not affect the position of the governing mechanism.

Referring more in detail to the drawings, I have shown an electric motor at M which is carried by a metallic base plate B. The electric motor may be of the ordinary construction and includes an armature shaft 1 which is mounted to rotate in bearings in the motor frame. There is an end thrust bearing 2 adjacent the left hand end of the motor shaft, as viewed in Figure 1 of the drawings. The motor is provided with terminals 3 and 4, the terminal 4 being electrically connected to the metal base 5. This metal supporting base 5 is adapted to be secured to the frame of the machine by suitable screws 6. Projecting laterally from the motor frame are spaced arms 7 and 8 which are provided with bearings for a vertical shaft 9, which is adapted to extend above the frame of the machine and support the table of the talking machine. The lower end of the shaft is mounted on a ball 10 carried by an adjustable abutment 11. The motor shaft 1 is connected to the shaft 9 by a worm gear connecting mechanism. Mounted on the shaft 1 is a sleeve 12 which is formed with a helical thread 13 forming the worm gear. Mounted on the shaft 9 is a sleeve 14 which is formed with a worm gear 15 which meshes with the worm gear 13. The sleeve 14 is fixed to the shaft 9 by a screw 16. The sleeve 12 is free to slide on this motor shaft. The sleeve 12 is fixed to a spring plate 18 in any suitable way so that said spring plate. 18 will move with the endwise movement of the sleeve and will rotate with the rotating movements of the sleeve. Fixed to the end of the shaft 1 is a drum 19 which is formed with slots 2020 and the ends of the spring member 18 extend through these slots. The width-of the slot is substantiallythe same as the spring plate 18 so that any rotating movements of the drum 19 will be imparted to the plate 18 and to the sleeve 12 to which the plate is attached. Mounted on the shaft 1 is a collar 21 and between this collar 21 and the end of the sleeve 12 is a felt collar be seen that the rotating movements of the motor shaft 1 will be 'imparted to the drum '19 and and 151to'tho vertical shaft 9 and thence to through this opening is a rod 27.

through the drum 19, the sleeve 12 and through the gears 13 the table of the talking machine. It will also be readily seen that any load on the shaft 9 tending to produce a back lash on the motor shaft or endwise movement thereof will be absorbed by this sprin plate 18. This will be explained more fu ly in the description of the operation of the machine.

At the opposite end of the motor shaft 1 there is a fly wheel 23. Mounted on the fly wheel 23 is a disc 24. This disc is insulated from the fly wheel and secured thereto by suitable bolts 25. The disc 24 has an opening 26 formed thcrethrough. Extending This rod 27 is mounted in a bracket 28 formed of insulating material. The rod has an enlarged end 29 and a spring 30 mounted in a seat in the bracket and bearing against this enlarged end normally forces the rod 27 out wardly away from the motor shaft. A shaft 31 formed with a threaded section 32 is mounted in this bracket 28. The lower end of this shaft is cone shaped as indicated at This cone shaped end of the shaft 31 bears against the enlarged rounded end of the rod 27. At the upper end of the shaft 31 there is a knurl finger piece 34 which may be used for turning the shaft 31 to raise and lower the same and through the cone shaped end on the shaft vary the endwise position of the rod 27.

Clamped by the lower bolt 25 is a spring arm 34. This spring arm 34 carries a contact 35 at its upper end, which is adapted to cooperate with the inner end of the rod 27 which also serves as a contact. This spring arm 34- is insulated from the motor frame but is electrically connected with the disc 24.

ounted in a suitable housing 35 carriedby the bracket 28 is a metallic brush 36 which is pressed by the spring 37 against the disc 24. The pressure of the brush is sufiicient to make good electrical contact and furthermore suflicient to push the shaft 1 so as to old the same against the thrust bearing 2 and thus prevent endwise movement of the shaft as it rotates. The housing 35" is carried by a plate 38 which is screwed to the bracket and this plate 38carries a terminal 39 which is connected by wire 40 with the terminal 3 and the terminal 3 is in turn connecfed with one brush of the motor. Lo cated in a suitable sistance coil is connected to the terminal 39 and the other is connected through the shaft 31 with a terminal 43. The terminal 44 is connected 'with the supporting plate 5 and with the terminal 4 which leads to the other brush. The terminals 43 and 44 are connected to any suitable source of current supply.

Mounted on the spring arm 34 is a weight 45. Said weight is connected to a projecting arm 46 so that the center of the weight is recess 41 in the bracket 28 -1s a resistance coil 42. One end of the reof the arm 34, As'

ll be the motor shaft rotates,

acted upon by centrifugal force and if the shaft reaches a predetermined' speed, the

weight will swing or move outwardly suffi-' cient to separate the contact 35 from therod 27 thus breaking the circuit through these contacts. When the contacts are closed,' the circuit leads from the source of supply through the terminal 43, the rod 27, the spring arm 34, the disc 2a, the brush 36, the terminal 39 to the terminal '3 of the motor. When however the contacts 25 and 27 are separated then the-circuit supplyleads from the terminal 43 through the resistance coil42 to the terminal 39 and thence to the terminal 3.

Let it be supposed for example that the motor has to be regulated to take care of voltage variation between ninety volts and 120 volts andthe desired motor speed is eleven hundred and fifty R. P. M. to give 78 R. P. M. to the table of the; talking ma.

chine. The resistance 42 will be so proportioned that with 120 volts and with a resistance in circuit, the motor will run too slow to give the desired speed. While with 90 volts and the resistance short circuited, the motor will run a little too fast to give the desired speed. It will thus be seen that: with the voltage varying from 90to 120'when the resistance is cutout,1the motor will always speed up and likewise whenv the resistance is cut in the motor will always'slow down. In obtaining the finger piece. orknob 34 is turned until the governor contacts are adjusted, using 110 volt current as standard, to obtain the-desired number of revolutions of the record, table. The number of revolutions may be measured in any desired way. By adjusting the shaft 31, the positionof the rod 27 may be varied so as to vary the number ofrevolutions imparted to the table per minute but when this rod is once set say for 78 R. P. M. on the table, then the governor will accurately control the speed of the motor so that even varies widely, the governor will readilytake care of such variations and maintain the shaft supporting the table of th''talking the fixed predetermined speed. In" order that this speed may be maintained very accurately and it is necessary'that the shaft will vary destroyer render ineflicient the control by the governor. The shaft 9 rotates in a clocks sufficient tov take shaft 31, the

place; that p is,

initial adjustment, the

I not vary "even a fraction" of a revolution per minute,

motor shaft .shall rotate in, afixed endwise; position, for any endwise shift of the motor the relative positions ofthe cont-act 35 and the end of the rod 27 and thus ally-j adapte [parted by a motor to the record table of a wise direction. In'order to accomplish this,

of the load on the shaft 9,the"spring mefi-;

,ber 18 will be moved to the right, increasing the pressure on the felt collar 22 and reactingon the drum I be no tendencyto endwise movement of the shaft 1, as this spring member 18 has shifted u this endwise thrust which would otherwise be imparted'to the motor shaft. It will be understood of course that thefelt collar.may be dispensed with. The-principal reason for utilizing collar is this felt to, do away with all possible noise. Consider however, that the reverse takes that the table runs ahead, owing forv example to a dro in the.voltage, whichslackens the speed 0 the motor, the shaft 9jtendsto continue its rotation due to the momentum of the table and therefore, the sleeve 12 carrying the worm gear 13 will be moved inwardly or to the left as viewed in Figure 1, drawing thespring member 18 away from the felt collar 11. Again it will be noted that the motor shaft is not moved endwise and consequently the relative position of the contact. 35 and the rod 27 are not in anyway disturbed.

The governor spring arm mally to hold the contact 35 in engagement with the rod 27 and this short circuitsthe resistance 42. When the speed of the motor increases, the weight 45 moves to the'right, thereby opening the contacts and the resistance 42 is placed in series with the motor windings. This immediately causes a drop in speed, whereupon the governor contacts I 35 and 27 close again short circuiti'ng the resistance 42causin the motor to speed In this way the res stance is out of the circuit and the sp is very accurately maintained at a predetermined speed. I j

While I have shown the equalizing mechanism as carried in part by the motor shaft, it will be understood that this equalizing mechanism may be disposed at any point in the train of mechanism between the motor shaft and the table of the talking machine. It will be noted that this equalizing mechanism while it is capable of taking up the end thrust, is at the same time a positive forward drive and thus the motor shaft .and

. P- thrown into and machine are maintained in perfect synchro msm. It is obvious that minor changes in the details of construction and the arrange ment of parts may be made withojut'depart- 'ing from the spint of the inventionias set forth in the appended talking machine, it will be understood "that it may be used in other relations and with other devices.

Having-thus fully described my'invention,

34 tends noreed ofthe motor 19. There will however,

trolling the supply causes the shaft and what I claim as new and desire to secure by Letters Patent is y 1. vThe having a driving shaft, of a driven shaft, and a train of mechanism for imparting movements from the motor shaft to the driven shaft, said train of mechanism including a resilient device for absorbing any end thrust which may be imposed u on said train of mechanism by the driven s iaft.

- 2. The combination with an electric motor having a driving shaft, of a driven shaft arranged at right angles thereto, and a train of mechanism for imparting movements from the motor shaft to the driven shaft, said train of mechanism including a worm gear'and a resilient device cooperating therewith for absorbing any end thrust which may be imparted by the worm gear on the motor shaft.

3. The combination with an electric motor having a driving shaft, of a driven shaft arranged at right angles to the driving shaft, worm gears for connecting the motor shaft and the driven shaft, the worm gear on one of said shafts being supported thereon, where-. by it. may be moved endwise of the shaft in response to an end thrust thereon by the driven shaft, and a resilientconnection between said endwise shiftable worm gear and the shaftsupporting the same, which ermits the gear to move endwise but w ich gear to rotate together.

4. The combination with an electric motor having a driving shaft, of a driven shaft, a centrifugally operated governor for conof current to the motor,

' said governor lncluding a contact supported 'cludinlg by the shaft and a second contact movable in a-direction parallel with the motor shaft, and a train of mechanism for imparting movement from the motor shaft to the driven shaft, said train of mechanism ina resilient device for absorbing any end t rust which may be im osed upon the train of mechanism by the d ii'ven shaft.

5. The combination with an electric motor having a driving shaft, of a driven shaft and a governor for controlling the supply of current to the motor, said cluding an adjustable fixed-contact, a spring arm carried b' the motor shaft. 1!. contact carried by sai arm and adapted to-engage the fixed contact, a weight fixed to said arm and disposed so as to move the end of the arm carryingthe contact in a line parallel with the armature shaft, and a trainof mechanism between the motor shaft and the driven shaft including a resilient devicefor abmrbing any end thrust which may be imposed driven v '6. The combination with anelectric motor havmg a driving shaft of a driven shaft and a governor-for controliing the supply of ouro combination with an electric motor having shaft mes governor inu n said train of mechanism by theills rent to the motor, said governor including an adjustable fixed contact, a spring arm carried by the motor shaft, a contact carried by said arm and adapted to engage the fixed contact, a weight fixed-to said arm and disposed so as to move the end ofthe arm carrymg the contact'in a line parallel with the armature shaft, and'a tram of mechanism between the motor shaft and driven shaft including a worm gear slidably mounted upon the motor shaft, a sprin plate connected tosaid worm gear mem r fixed to said shaft and connected with the outer ends of the spring plate.

e combination with an electric motor a driving shaft, of a driven shaft and a governor for controlling the supply of current to the motor, said governor including an adjustable fixed contact, aspring arm carried by the motor shaft, a contact carried by said arm and adapted to eng the fixed contact, a weight fixed to said arm and disposed so as to move the end of the arm carrying the contact in a line parallel with the armature shaft, a train of mecha nism between the motorshaft' and driven shaft including a worm gear slidably mounted upon the motor shaft, a spring plate connected to said worm gear, amember fixed to said shaft and connected with the outer ends of the spring plate, a felt collar disposed between the worm gear and a stop collar on the end of the shaft.

8. The combination with an electric motor having a driving shaft, of a driven shaft at "right angles to the driving shaft, a governor for controlling the supply of current to the motor including a fixed contact and a centrifugally controlled movable contact supported by said driving shaft and disposed so as to move in a direction parallel with the axis of said driving shaft, a sleeve slidable on the motor shaft and carrying a worm ear, a worm gear on the driven ing with the worm gear on the motor sh'a a memberfixed to the motor shaft and a yielding spring member inter- Epsed between the sleeve and the fixed mem- 9. The combination with an electric motor having a driving shaft, of a driven shaft at right angles to the driving shaft, a governor for controlli the supply of current to the motor including a fixed contact and a centrifugally controlled movable contact disposed so asto move in a direction parallel with the axis of the motor shaft, a sleeve slidable on the motor shaft and carrying a worm gear, meshing with the worm gear on the motor shaft, a drum fixed to the end of the shaft, a spring plate fixed to the sleeve and connected to the drum at its outer ends so that the rotating movements of the motor shaft through-the drum and spring plate are ima worm gear on the driven shaft -tates,

parted to the sleeve, said spring plate being disposed so as to permit the sleeve to move endwise on the motor shaft to take up all end thrust imposed on the driving worm gear by the driven shaft.

10. The combination of a motor frame having a motor shaft, an end thrust bearing adjacent one end of the motor shaft, a fly wheel mounted on said end of the motor shaft, a centrifugally controlled movable contact carried by the fly wheel, a contact disc carried by the fly wheel, an adjustable contact cooperating with the movable contact, a spring prssed brush bearing against the disc and forcing-the shaft against the thrust bearing whereby said motor shaft is held from endwise movement as it roa driven shaft at the opposite end of the motor shaft, a worm gear slidably mounted on the motor shaft and engaging a worm gear on the vertical shaft, resilient means for conecting the sliding worm gear to the motor shaft whereby said worm gear may move endwise of the motor shaft and thus absorb any end thrust imposed upon the driving worm gear by the driven shaft.

11. The combination with an electric motor having a motor frame having an end thrust bearing for the motor shaft, a centrifugally operated governor for controlling the current supply to the motor, said governor having a contact movable with and in a direction parallel with the axis of the motor shaft and yielding means for forcing themotor shaft against the end thrust bearing, a driven shaft and a train of mechanism between the driven shaft and the motor shaft including a resilient device for absorbing any-end thrust which may be imposed upon the train of mechanism by the driven shaft.

12. The combination with an electric motor having a driving shaft, a driven shaft arranged at right angles to the driving shaft, a sleeve slidable on the driving shaft and carrying a worm gear, a worm gear on the driven shaft meshing with the worm gear on the driving shaft, a drum fixed to the end of the driving shaft, a spring plate fixed to the sleeve and connected to the drum at its outer ends so that the rotating movements of the driving shaft through the drum and spring plate are imparted to the sleeve, said spring late being disposed so as to permit the sleeve to move endwise on the motor shaft to takeup all end thrusts imposed on the driving worm gear by the driven shaft.

In testimony whereof I hereunto afiix my signature.

WILLIAM W. DEAN. 

